[erlang-questions] Any canonical bandwidth benchmarks for clusters?

[Serge Aleynikov]

First of all you would always expect IP over IB to be significantly 
slower than the MPI/IB interface, because the later uses RDMA and 
bypasses the OS's TCP/IP stack.  I my experience with IP/IB, sending 
large messages degrades throughput quite noticeably.  Try to split 
messages in smaller chunks and redo the benchmark for different message 
sizes.

Serge

Allen McPherson wrote:
> I'm testing some code that is showing terrible bandwidth
> on our 40+ node Infiniband cluster (7 MB/sec for a ring benchmark!).
> This code is using the IP over IB interface and send big (1+ MB)
> messages around (binaries and non-binaries).  MPI code runs
> at good rates on this cluster.
> 
> Before I post my code I thought I'd see if there were
> existing bandwidth benchmarks for distributed Erlang
> on a locally connected cluster. Haven't been able to
> find any via Google. Does anyone know of, or have, code
> that I might use to test.
> 
> Lacking other tests I'll put together a longer post with
> my code included and maybe someone else with a similar
> cluster could run it?
> 
> Thanks
> --
> Allen McPherson
> Los Alamos National Laboratory
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